Question

find the circumference of a circle with radius 21​

Answer 1

Answer:

$2\pi r$

is the circumference of circle.

2πr

2 x 22/7 x 21

2 x 22 x 3

132

132 is the final answer.

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Answer 2

Answer:

132

Step-by-step explanation:

C=2πr

r=21

∴ C=2×22/7×21

    = 132